渗碳钢轴承磨削变质层的结构研究  

STRUCTURAL STUDY ON GRINDING AFFECTED LAYERS OF CARBURIZED STEEL BEARING

作　　者：李建明[1] 靳九成[1] 李学谦[1] 谢中[1] 夏宗禹[1] 高香山[1] 

机构地区：[1]湖南大学

出　　处：《机械工程学报》1995年第3期84-90,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金

摘　　要：系统研究了２０ＣｒＮｉ２ＭｏＡ渗碳钢铁路轴承精磨时，由于砂轮、工件与冷却液之间的热－化学与热－机械作用，滚道面的成分与组织变化。结果表明，轴承滚道面形成了磨削变质层。变质层由表至里是由吸附层、氧化层、白层及过回火塑性变形层组成。氧化层是Ｆｅ与合金元素氧化物组成的混合结构，并存在Ｓｉ的表面富集。氧化层厚度不超过２０ｎｍ。白层的组织为细化了的高碳织构马氏体与沿磨削切应力方向拉长了的细小的奥氏体。在过回火层中，硬度低于６００ＨＫ的区域不超过１０μｍ。变质层的总厚度及白层厚度均随砂轮径向进给速度增加而加厚。A systematic study of the changes in composition and structure of surface layers due to the thermo-chemical and thermo-mechanical affects among the wheel, the workpiece and the grinding fluid during precision grinding on carburized steel 20CrNi2 MoA railway bearing has been conducted. Results show that the grinding affected layers are generated. The grinding affected layers on bearing surface consist of absorption layer,oxide layer, white layer,overtempering and plastic deformation layer. The oxide layer is a mixed structure which consist of Fe and alloy elements oxides, the thickness is not greater than 20nm,the structure of white layer is very fine texture martensite and fine austenite which was elongated in the tangential stress direction.The depth of zone in which the hardness is less than 600HK was not greater than 10μm in the overtemper layer under normally conditions. The thickness of white layer and grinding affected layer incerased as the downfeed was increased.

关 键 词：轴承 磨削变质层 显微组织 渗碳钢轴承 结构 

分 类 号：TH133.3[机械工程—机械制造及自动化]